/*
 * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

var express = require('express');
var bodyParser = require("body-parser");
var app = express();
var APP_PORT = 8088;

Polyglot.evalFile("ruby", "validator.rb");
var Validator = Polyglot.import('Validator');

Polyglot.evalFile("R", "functionGraph.r");
var plotFunction = Polyglot.import('plotFunction');

app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());

app.post('/graph', function (req, res) {
    let expr = req.body.expr;
    let x1 = req.body.x1;
    let x2 = req.body.x2;
    if (!x1 || !x2) {
      x1 = -10;
      x2 = 10;
    }
    let errorMsg = Validator.validate(expr);
    if (errorMsg.length() == 0) {
        res.send(plotFunction(expr, x1, x2));
    } else {
        res.send(errorMsg);
    }
});

app.use(express.static(__dirname + "/public"));
app.listen(APP_PORT, function() {
    console.log("Server listening on port " + APP_PORT);
});
